Meter.



No. 783,486. PATENTBD FEB. 28, 1905.

' J. A. TILDEN.

METER.

APPLICATION FILED 00T. 7. 1904.

WKN

ATTORNEY tte. "realise iTnn STATES Patented February 28, 1005.

PATENT OFFICE.

JAMES A. TILDEN, OF HYDEPARK, MASSACHUSETTS, ASSIGNOR TO HERSEY MANUFACTURING COMPANY, OF SOUTH BOSTON, MAS- SACHUSETTS, A CORPORATION OF MAINE.

METER.

SPECIFICATION forming part of Letters Patent No. 783,486, dated February 28, 1905.

Application liled October 7,1904. Serial No. 227,599.

lowing is a specification.

My invention relates to Huid-meters, and particularly to those ot' the proportional type. [n such apparatus some fractional part of the entire flow is measured by a suitable registering mechanism, any error in which will be multiplied in determining the total amount. For this reason it is very essential that means be provided for conveniently testing' the accuracy of the registering mechanism, and to furnish this is the principal object of this invention.

The drawing illustrates in side elevation one embodiment of my invention.

The proportional meter shown is a wellknown form, in which a Venturi tube 10 constitutes a resistance device and serves as a part of a main conduit 11 and has connected to its portion 12 of maximum diameter a by-pass conduit 13. which also opens into the tube at its throat 12". In the by-pass is inserted a registering mechanism, which may be any suitable meter 1A, recording the passage of liuid through it---as, for example, one of the piston or disk type. The by-pass is provided with an opening having' associated with it controlling means, in the present instance consisting of an outlet-Valve 15. In the by-pass on the opposite or eduction side ol the opening' from the registering mechanism is a valve 16 for controlling the flow into the main conduit, the registering mechanism being' on the induction side of said opening. The valves may both have socket-stems 17 to receive keys, this preventing their being' tampered with by unauthorized persons. Made into the outlet of the valve 15 is shown a nipple 18, to which is attached a hose 19, conducting the discharge to any desired point.

The Huid-flow divides itself between the main conduit and by-pass, the proportion being substantially constant, and when the registering mechanism is correct the total amount passing is givenby multiplying its reading by the proper constant. It' it is desired to examine the registering' mechanism to determine its accuracy, it is only necessary to close the valve 16, thus stopping the flow from the bypass into the main conduit and to open the valve 15. The hose being arranged to direct the low into a receptacle which may be weighed, a comparison ol the quantity discharged with the reading' ot' the measuring mechanism will permit any error of the latter to be ascertained and corrected, eithei` by adjusting the mechanism or altering the constant. lt should be noted that this testing operation in no way interferes with the service, the delivery continuing through the main conduit and the operation ot' the registering mechanism being only momentarily interrupted.

Having thus described my invention, I claim 1. The combination with a main conduit, ot' a resistance device in said conduit, a by-pass conduit associated therewith and being provid ed with an opening, registering mechanism in the by-pass, means for controlling the flow from the by-pass opening, and a valve in the by-pass situated upon the eduction side ot' the opening. Y

2. A proportional meter comprising a Ven turi tube, a by-pass conduit. opening from the maximum diameter and from the throat ot' said tube, a registering-meter in the by-pass, an outlet-valve in the by-pass upon the eduction side of the registeriIig-meter, and means I'or controlling the How through the by-pass into the tube.

3. A proportional meter comprising a main conduit, a resistance device in said main conduit, a by-pass conduit opening from the main conduit at each side of the resistance device, a registering-meter in the by-pass, an outletvalve in the ley-pass upon the eduction side of the registering-meter, and means for controlling the tlow through the bypass into the main conduit.

A. A proportional meter comprising a main conduit, a resistance device in said main conduit, a by-pass Conduit openingfrom the main l Signed at Boston, in the county of Suiolk conduit at each side of the resistance device, and State of Massachusetts, this Lkth day of Oca registering-meter in the by-pass, an outlettobei', 1904. valve in the by-pass upon the eduotion side of 1 JAMES A. TILDEN.

Witnesses:

FRANCIS C. HERSEY, J r.,

HENRY D VINTON.

the registering-meter, rfind a valve in the bypass situated upon the eduotion side of the outlet-Valve. 

